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His group was involved in the kidnapping of American soldiers in 2006, the military commander said.

As "emir for foreign terrorists," al-Tunisi reportedly coordinated the movement of such fighters into the country and helped equip insurgents for bomb attacks.

Meanwhile, a coalition raid Friday left at least 10 people dead in Baghdad -- some of whom may have been noncombatants, an Iraqi Interior Ministry source said.

A coalition account described the dead as insurgents.

The raid by coalition troops, aided by Iraqi special forces, targeted a residential building in southern Baghdad's Dora district, an Interior Ministry source said.

Twelve people also were injured, and apartments were damaged, including some that caught fire, the source said.

The deaths come at a time when the Iraq government has expressed concern over Iraqi civilians caught in crossfire and killed by coalition forces or U.S. contractors.

The U.S. military said Thursday that coalition forces were investigating an incident Tuesday night that led to the deaths of nine civilians -- five women and four children. Their bodies were found in a village west of Musayyib.

In a coalition raid Wednesday, U.S. soldiers discovered insurgent propaganda extolling the September 11, 2001, attacks on the United States, the military said Friday. In a cache in a house south of Baghdad, troops found "a small booklet featuring images of the attacks and a script praising the attacks."

"Our assessment is that these guys were getting ready to launch attacks during the Ramadan celebration," said Lt. Thomas Ceislak, referring to the Muslim holy month.

Troops detained the owner of the house. They also found three blasting caps, a ski mask, a terrorist manual that included directions on building car bombs, two cell phones and a card to activate the cell phones.

Other developments

The number of foreign fighters entering Iraq has been cut cent to about 35 a month, according to Brig. Gen. Joseph Anderson, chief of staff for the Multi-national Corps in Iraq. He said foreign fighters are responsible for about 80 percent of suicide bombings in Iraq.

The U.N. refugee agency on Friday expressed "grave concern" over the kidnapping and killing of a humanitarian worker in the southern Iraqi city of Basra. The 31-year-old Iraqi worked for Intersos -- an Italian group devoted to helping victims of natural disasters and armed conflicts. He was kidnapped Tuesday by militias, which have a large presence in the predominantly Shiite city. The humanitarian worker's body and that of a friend were found in a morgue, according to his group.